Hi Srinath,
I think we're using the CW compiler because no-one has tested any others yet with AQ. I don't see any reason it won't work with others though.
BTW, in anyone is interested, the same compilation method described above for Linux will also work on Windows, even with the same makefile (just have to adjust the path to CW). You do need "make" and a couple other utilities, and the easiest way to get those on Windows, if you don't have Cygwin already, is to download Yagarto Tools -- http://www.yagarto.de/ (first download package).
I've also managed to set up a dev environment in Eclipse, including compiling and debugging.
If anyone wants more info, let me know.
-Max